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Washboard.
Patent for a washboard, with improvements to the conventional washboard such as "having a scrubbing surface formed of transversely arranged, longitudinally twisted wires, which (...) have their ends cleated to the board which prevent displacement" (lines 15-19), including illustrations.
Date:
October 24, 1916
Creator:
Butler James. F.
System:
The Portal to Texas History
Piano-Hammer.
Patent for a piano hammer, which has a strip of striking material that can be moved over to a new section when one section wears out, to increase the life of the hammer.
Date:
May 24, 1910
Creator:
Young, Henry E.
System:
The Portal to Texas History